2025-07-29 00:00:00 SENKO GTG Device Manager App. SI-Series and SP-Series detectors was developed to prevent unfortunate accidents caused by gas explosions in hazardous places such as plants, gas storages, and factories. When installed in hazardous area, Toxic gas detector SI-Series will regularly and continuously detect the gas leakage and display the data with FND and to supply 4-20mA standard output.